Lavenian refers to a turian (gay man or non-binary person) who is gender non-confoming. It is considered to be a subset of turian. Not all GNC turians need to use lavenian unless they want to. Lavenian is less of a label of itself and is more of a specification, but it can be used in place of turian/gay if the user so chooses.
Etymology
Lavenian stems from the word "lavender", flowers which are historically tied to GNC people and/or MLM, such as terms like lavender boy. It is strongly tied to terms like lavender boy, but it is specifically for those who identify as gay.
Flag
The lavenian flag was made by Tumblr user pridewiki on November 13, 2020[1]. The stripes do not have individual meanings, and are instead a version of the turian flag that uses purple and pink hues, to represent lavenders and/or gender non-conformity.